Check out this unofficial list of the 2013 NFL restricted and unrestricted free agents, which includes
Greg Jennings.
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It should be noted that the majority of NFL general managers weren't willing to pay "Vincent Jackson money" to Jackson last year, either.

Considering age, talent and production over the past three years, Wallace remains the top receiver on the market this offseason. All it takes is one team to believe he's worth $50 to $60 million over five years.